Make TextCaseStartReplacingCommand more flexible

[peterfication]

Right now it only considers the full current word. It would be nice if it would use the part where the cursor is on.

• For CarList with the cursor on Car it would open Subs/Car/
• For EnhancedCarList with the cursor on Car it would also open Subs/Car/

Issue #135 with PR #137 tackles the first case. The second case is more complex to implement.

[peterfication]

In the end, PR #137 implemented both cases.

[johmsalas]

Dot repeatability. Just thinking in edge cases. I don't think it should support dot repeating. Curious what you find in your workflow

[peterfication]

I think it can be "too big" to be dot repeatable. Normally, I such cases I use it and do adjustments to the file. Then I might make similar changes to another file. But it's ok to write it out again or go back in command history I'd say.