Rearrange StatBlock loading

basic stats moved to a common function used by both enemies and avatar
refactor min stat checking
Remove desktop file and svg icon

These files should be per-game.
Implemented partial XP tracking.
Fixes the rounding issue where the +25% XP ring gives no real gain
on kills of less that 4 XP (e.g. level 1 enemies).
Merge pull request #714 from dorkster/bugfixes

Remove desktop file and svg icon
Merge pull request #716 from Puros/master

Cumulative bonus XP
Merge pull request #709 from RyanDansie/stat_standardise

StatBlock loading changes