Fixes #85 : Broken support for relative path on main file / exe
Rename Icon view => Grid view

Rename in the code too.
GameIconView and GameTreeView classes become
GameGridView and GameListView respectively.
Invert Grid/List switch buttons + better tooltips

The switch view buttons order now match the menu items order.
Fix multiple_file_chooser
Provide Mupen64 runner
Provide Hatari runner
Provide atari800 runner
Provide Stella runner
OSS Wrapper option default quickfix
Second half of the previous fix...
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Merge branch 'next'
Change target of LutrisWindow.ui to GTK 3.10
Provide mednafen runner
Provide mame runner
Provide MESS runner
Provide DOSBox runner
Oops, extra space in here
Fix some pyflakes finds
Provide Vice runner