lib/igc: Compile regular expressions only once
lib/igc: Compile regular expressions only once

No need to compile them on every function call

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