Dynamic alter methods do not convert to proper lowerCamelCase

Problem/Motivation

The method names generated by ThemeSuggestions::getAlterMethods() are created prepending 'alter' to each suggestion, after making the first letter of each suggestion uppercase. This produces method names like this:

• alterInput
• alterSelect
• alterUser

which are fine. However, it also produces method names like this:

• alterStatus_messages
• alterForm_element
• alterForm_element_label

which technically will work, but violate coding standards for following lowerCamelCase naming for methods. Instead, they should be like this:

• alterStatusMessages
• alterFormElement
• alterFormElementLabel

Proposed resolution

Change ThemeSuggestions::getAlterMethods() so that all method names are fully lowerCamelCase, with no underscores.