Add the ability to search and find text in the current track

[sirken]

Hello, I've enjoyed using your project and find it very useful, thanks for creating it.

One feature I found myself missing was the ability to do a text search to find lyrics instead of visually scrolling to find the location, so I created a basic find function. The keys are similar to the less or vim style search and can be changed via the config. If you're interested in using any of the code, here it is.

In the PR are the following updates:

New find function

• Added the ability to find text
• Matches in each line are highlighted
• Ability to progress to the [n]ext or [p]revious line match
• Keys can be changed via the config file

Other updates

• Added a status bar with track scroll percentage
• Status bar can be turned on/off via the config file
• Changed the track so it can scroll to 100% and be compatible with the find functionality
• Moved [a]uto scroll and [d]elete track status items flush left to be compatible with percentage position

Regards!