Block WX input when detecting controls

Nothing used the RegEx feature of FileSearch, and GCC < 4.9
doesn't support C++11 RegEx properly, so get rid of it.

Main Stick is changed to Control Stick and C-Stick is changed to C Stick.

A new ui_name variable is added to ControlGroup so that the UI strings
in DolphinWX can be updated without breaking backwards compatibility
with config INIs and other things that use names as IDs.

- FileSearch is now just one function, and it converts the original glob
  into a regex on all platforms rather than relying on native Windows
  pattern matching on there and a complete hack elsewhere.  It now
  supports recursion out of the box rather than manually expanding
  into a full list of directories in multiple call sites.

  - This adds a GCC >= 4.9 dependency due to older versions having
  outright broken <regex>.  MSVC is fine with it.

- ScanDirectoryTree returns the parent entry rather than filling parts
  of it in via reference.  The count is now stored in the entry like it
  was for subdirectories.

- .glsl file search is now done with DoFileSearch.

- IOCTLV_READ_DIR now uses ScanDirectoryTree directly and sorts the
  results after replacements for better determinism.