Add function to manually control mouse-capture

[hasezoey]

Description

This PR adds manual function to enable / disable mouse-capture.
The reason being some TUI applications dont need / want to handle mouse events (and couldnt even without #79).
And some TUI applications may want to disable mouse-capture temporarily to have native text copy again.

Also change to not have MouseCapture enabled by default.

Fixes #64 as this will automatically translate mouse scroll to keyboard scroll again.

Type of change

Please select relevant options.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Note: because TerminalError is not marked non_exhaustive this change could be considered breaking

Checklist

• My code follows the contribution guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I formatted the code with cargo fmt
• I checked my code using cargo clippy and reports no warnings
• I have added tests that prove my fix is effective or that my feature works
• I have introduced no new C-bindings
• The changes I've made are Windows, MacOS, UNIX, Linux compatible (or I've handled them using cfg target_os)
• I increased or maintained the code coverage for the project, compared to the previous commit

Note: i am not sure how i should add tests for this