* Replace the wxListCtrl with a wxTreeListCtrl, allowing expandable categories
in a future change.
* Clean up the code to make HOTKEY_LIST_CTRL function a bit better on its own.
* Migrate the hotkey dialog to TransferData{To,From}Window, use matching
TransferData{To,From}Control methods on HOTKEY_LIST_CTRL so it is easy to
embed.
Refactor hotkey editor to use tab control instead of one giant list.
Each tab is a separate hotkey section.
Modify EDA_HOTKEY_CONFIG to change the m_Comment member to m_Title for a new purpose.
We want a pretty title in the hotkey editor. We use m_Title for the key export comment which
still conveys the purpose just as easily.
Refactored usage of wxGrid into wxListCtrl which allows capturing navigation characters
and also works better (single selection is built in).
Add hotkey overwrite prompts that are paired with "Common" section. It will check if a hotkey
overlaps with the proper sections. i.e. Common with the all other sections; or Section 1 with just Common.
Right-click menu removed due to wxListCtrl being able to catch the special keys properly.
File "rules" has instructional text as comments near top.
2) Convert all text files in repo to LF line ending form.
Any checkout done with "rules" in play will convert the working
tree to native line ending, while keeping repo as LF line ending.