Remove several editor commands in overhaul

[SeeminglyScience]

In 0.5.0 every editor command had to be rewritten due to an overhaul of the module. There are some editor commands that are either non-trivial, or I suspect they do not get any usage.

Below is a comment for every editor command that is being considered for removal in 0.5.0. If you use any of these, please 👎 the comment they are contained within.

[SeeminglyScience]

Function Name: ConvertTo-LocalizationString
Display Name: Add Closest String to Localization File
Description: Replaces a string expression with a variable that references a localization file, and adds the string to that file

[SeeminglyScience]

Function Name: ConvertTo-MarkdownHelp
Display Name: Generate Markdown from Closest Function
Description: Generate markdown using PlatyPS, add the markdown file to your docs folder, and replace the comment help with an external help file comment.

[SeeminglyScience]

Function Name: Add-PinvokeMethod
Display Name: Insert Pinvoke Method Definition
Description: Searches the pinvoke.net web service for a matching function and creates a Add-Type expression with the signature

[SeeminglyScience]

Function Name: Expand-Expression
Display Name: Expand Selection Text to Output
Description: Invoke the currently selected text and replace it with the result.

[SeeminglyScience]

Function Name: Remove-Semicolon
Display Name: Remove cosmetic semicolons
Description: Remove semi-colons that are at the end of a line, not in a string, and not a part of a property definition in a class.

[SeeminglyScience]

Function Name: Set-HangingIndent
Display Name: Set Selection Indent to Selection Start
Description: Indent selected lines to the start of the selection.