Bumped version to 0.2.1
Part of the T51547:
Solve the key registration / reload issues related to the
keys being registered and never removed
moved to the new key register system
text.test_line was used as the bl_idname of a Panel and an
Operator
Pep8 cleanup
Replace tabs with spaces
Fix crashes on empty text block - add a check for that case
Comment out the pdb runcall as it needs a specific function
or a object method not a string
Use the with method for the file creation