Extend `pm-list` to list modules, themes and profiles and filter by project status (enabled|disabled|uninstalled...)

So the proposal here could be to use the new name for statusmodules (pm-status or pm-list as suggested in #678574-12: Add "pm-" namespace to all of the pm commands) extending it to list themes (code already here #530780: drush commands to administer themes) and perhaps profiles AND add a two new options:

* --project-type=modules|themes|profiles
* --status=any|enabled|disabled|uninstalled (some choices not applicable depending on the project-type).
* make --pipe work in concordance with --status

Changing title.

Several issues involved in `statusmodules`at present. Waiting for #654682: drush statusmodule --package: Package column and grouping for the statusmodules list and #677894: untangle pm_module_manage() a bit.

patch with options proposed in #2.

Internals:
1. new function drush_get_projects(). Used by pm-list and pm-info. To be used by pm-enable/disable.
2. new function drush_get_project_status() returns enabled/disabled/uninstalled. Used by both pm-list and pm-info. Can be easily extended to support "missing" with naught101's code in #496008: More useful info in statusmodules.

Feature request: provide options for module packages. not applicable for themes... or use base theme as package info¿?. related: #654682: drush statusmodule --package: Package column and grouping for the statusmodules list.

ps. patch also fix minor things for pm-info

new patch with a fix for --pipe.

note the listings don't have a column for given filter options.

screenshots:

$ drush pm-list --type=theme
 Name                                            Status    Version     
 Garland (garland)                               Enabled   7.x-dev     
 Seven (seven)                                   Enabled   7.x-dev     
 Stark (stark)                                   Enabled   7.x-dev     
 Update test base theme (update_test_basetheme)  Disabled  7.x-dev     
 Update test subtheme (update_test_subtheme)     Disabled  7.x-dev     
 Zen (zen)                                       Enabled   7.x-3.x-dev 

$drush pm-list --type=theme --pipe
garland seven stark update_test_basetheme update_test_subtheme zen

$ drush pm-list --type=theme --status=enabled
 Name               Version     
 Garland (garland)  7.x-dev     
 Seven (seven)      7.x-dev     
 Stark (stark)      7.x-dev     
 Zen (zen)          7.x-3.x-dev 

$ drush pm-list --type=theme --status=enabled --pipe
garland seven stark zen

$ drush pm-list --type=module --status=enabled
 Name                                   Version     
 Administration menu (admin_menu)       7.x-3.x-dev 
 Block (block)                          7.x-dev     
 Contextual links (contextual)          7.x-dev     
 Dashboard (dashboard)                  7.x-dev     
 Devel (devel)                          7.x-1.x-dev 
 Field (field)                          7.x-dev     
 Field SQL storage (field_sql_storage)  7.x-dev     
 Field UI (field_ui)                    7.x-dev     
 Help (help)                            7.x-dev     
 Menu (menu)                            7.x-dev     
 Node (node)                            7.x-dev     
 Number (number)                        7.x-dev     
 Overlay (overlay)                      7.x-dev     
 Search (search)                        7.x-dev     
 Shortcut (shortcut)                    7.x-dev     
 System (system)                        7.x-dev     
 Taxonomy (taxonomy)                    7.x-dev     
 Text (text)                            7.x-dev     
 Toolbar (toolbar)                      7.x-dev     
 User (user)                            7.x-dev     

$ drush pm-list --type=module --status=enabled --pipe
admin_menu block contextual dashboard devel field field_sql_storage field_ui help menu node number overlay search shortcut system taxonomy text toolbar user

From a developer viewpoint perhaps hidden should appear in the listing. I have no preferences here.

Uninstalled status is a mix of enabled=0 and schema_version=-1. There's no way to differentiate uninstalled / never installed beyond some heuristics (weight != 0 or other garbage in system table --not always available). The message can be "not installed". I think it is of interest because a disabled module is still a installed one. Although it can be confusing for a end user. No special preferences neither.

filters and grep: filters are user friendly and of special interest in conjunction with --pipe. Think of

drush pm-uninstall `drush pm-list --pipe --type=module --status=disabled`

filters can also be easily extended to support more than one option: --status=disabled|uninstalled.

Modules pending uninstall are those with enabled=0 and schema_version > -1 and define hook_uninstall. Once uninstalled, no way to know if it was installed any time in the past or is a pristine one afaics. I've changed uninstalled to not installed.

Also hidden modules are out in this patch.