Fix spelling errors

[dforsi]

Fixed with:
codespell --ignore-words-list=dout,feets,fo,inout,ist,ot,parm,usng src --write-changes --interactive=2
and manual editing.

I did not change the following words because OVERLAYED and Lightening are in the file data/symbolsX.txt and Pres and CONVERS seems to be false positives:

src/mgn_icon.h:211: OVERLAYED ==> OVERLAID
src/mgn_icon.h:213: HURICANE ==> HURRICANE
src/mgn_icon.h:223: Lightening ==> Lightning, lighting
src/mgn_icon.h:266: OVERLAYED ==> OVERLAID
src/mgn_icon.h:267: OVERLAYED ==> OVERLAID
src/mgn_icon.h:271: OVERLAYED ==> OVERLAID
src/grm_sym.h:436: OVERLAYED ==> OVERLAID
src/grm_sym.h:438: HURICANE ==> HURRICANE
src/grm_sym.h:448: Lightening ==> Lightning, lighting
src/grm_sym.h:491: OVERLAYED ==> OVERLAID
src/grm_sym.h:492: OVERLAYED ==> OVERLAID
src/grm_sym.h:496: OVERLAYED ==> OVERLAID
src/telemetry.c:1202: Pres ==> Press
src/telemetry.c:1210: Pres ==> Press
src/symbols.c:196: OVERLAYED ==> OVERLAID
src/symbols.c:198: HURICANE ==> HURRICANE
src/symbols.c:208: Lightening ==> Lightning, lighting
src/symbols.c:251: OVERLAYED ==> OVERLAID
src/symbols.c:252: OVERLAYED ==> OVERLAID
src/symbols.c:256: OVERLAYED ==> OVERLAID
src/tnctest.c:1259: CONVERS ==> CONVERSE, CONVERTS, CONVERT

[wb2osz]

Thanks for pointing out all those careless mistakes.