Support "local font" for editor

[GWRon]

BlitzMax is "portable". But if you want to setup a specific default font then this font has to be installed in the system.
This leads to the "font setting" being not portable.

MaxIDE should allow the usage of a local .ttf/.otf font. That way we also could provide a consistent look by using a custom font shipped with MaxIDE (eg. InconsolataGo).

Another thing is the default "style" - which has this basic-look and does not follow the default theme of the OS (so it should eg. have the background color of an "text area widget"). This is a minor but I wanted to write it down before I forget about it ;-)