There's only one plugin api for this, but GSdx also checks whether shift/ctrl
are held down, so PCSX2 needs to map those too to the same API.
Make this more systematic by only mapping one shortcut to this API, and then
deriving the other two from it amd mapping them too automatically.
This also makes it possible to override it at PCSX2_keys.ini since now it
doesn't need to handle different shortcuts for the same function (which it still
can't handle, but now it also doesn't need to for this function).
This patch fixes 3 different issues for wx event key codes and the ini parser.
- The ini parser (for PCSX2_keys.ini) parses symbols and letters correctly,
but parsed `shift-q` as `Q` without shift. Now it's parsed as `q` with shift.
- the wx event keycode has the shift flag set correctly, but always has the
upper case code for letters (e.g. `Q` when `q` was pressed, and `Q` with shift
flag when shift-q is pressed). Now uses lower case for letters.
- For symbol-only keys (e.g. `-` or `=`), the keycode is the MS VK_.. thingy,
e.g. for `=` it passed 187 instead of 61, or for `.` it had 190 instead of 46.
Now returns the ascii code where possible (assuming US KB layout).
Also, when the DevCon is enabled, all key presses are printed to the console in
a format which could be copied to pcsx2_keys.ini, so this should allow also
non-US KBs to be set up for arbitrary symbols.
It should now be possible to use letters and symbols at PCSX2_keys.ini or as
default accelerators definitions within the code.
Note: this should have supposedly been fixed at r4918 ( 851bfba ), but neither
that build from the buildbot archive, nor the official 1.2.1 release (r5875),
nor the current builds have this working, which is really weird (tested on win8)
