added error dialog to script window write function
added error dialog to script window read function
updated release notes
reworked drawing algorithm so it's more geometrically correct
optimized so background doesn't redraw on every GPS position update
made runtime reader thread joinable to prevent crashing conditions on some hardware/windows versions
updated release notes
Merge pull request #1 from autosportlabs/master

Get changes from master
Merge branch 'master' into linux_step_1
Merge branch 'linux_step_1' into linux_step_2