Add configuration option to hide fingerings

[craigsapp]

Add an option to the configuration panel that hides fingerings in a score.

This could be done with the filter shed -e s/fing/FING/X

Example:

https://polishscores.org/?id=pl-wtm--iii-41-637-1--001-001

This can be done currently with the free-form filter option in the configuration panel:

[craigsapp]

Implemented in commit 7e729ac

Example:

Score with fingerings:

https://polishscores.org/?id=pl-kozmzk--mzk-m-31--001-002

Hiding fingerings:

The URL configuration code for "Hide finterings" is Hf.

https://polishscores.org?id=pl-kozmzk--mzk-m-31--001-002&con=Hf