lib/igc: Simplified parse_*() functions
lib/igc: Simplified parse_*() functions

dkm/skylines,dkm/skylines,snip/skylines,dkm/skylines,shadowoneau/skylines,RBE-Avionik/skylines,Harry-R/skylines,Harry-R/skylines,Turbo87/skylines,kerel-fs/skylines,TobiasLohner/SkyLines,RBE-Avionik/skylines,kerel-fs/skylines,Turbo87/skylines,TobiasLohner/SkyLines,RBE-Avionik/skylines,RBE-Avionik/skylines,shadowoneau/skylines,shadowoneau/skylines,kerel-fs/skylines,Turbo87/skylines,skylines-project/skylines,skylines-project/skylines,dkm/skylines,skylines-project/skylines,Harry-R/skylines,Turbo87/skylines,skylines-project/skylines,Harry-R/skylines,snip/skylines,snip/skylines,TobiasLohner/SkyLines,shadowoneau/skylines