Cache version.version in MainFrame
Cache version.version in MainFrame

Change-Id: I5d2eccb3e1470159f2ee416994c1b1465af8f068
Reviewed-on: http://gerrit.dmdirc.com/418
Tested-by: Gregory Holmes <10bcf006358d67bf0012f7a1fa55af679f2aae55@dmdirc.com>
Reviewed-by: Chris Smith <711c73f64afdce07b7e38039a96d2224209e9a6c@dmdirc.com>

csmith/DMDirc-Plugins,DMDirc/Plugins,DMDirc/Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins,DMDirc/Plugins,csmith/DMDirc-Plugins,csmith/DMDirc-Plugins