Support end-of-line comments in scl files

[narenratan]

I ran into some scl files which use end-of-line comments on each ratio, for example septenariusGG49.scl from the Scala scale archive:

! septenariusGG49.scl
Sparschuh's version @ middle-c'=262Hz or a'=440Hz
12
!absolute pitches relativ to c=131 Hz
555/524 ! c# 138.75 Hz
147/131 ! d
156/131 ! eb
165/131 ! e
175/131 ! f
185/131 ! f#
196/131 ! g
208/131 ! g#
220/131 ! a 440Hz/2
234/131 ! bb
247/131 ! b
2/1

At the moment a . in the comment causes the line to be interpreted as a cent value, which can give unexpected results. For example for septenariusGG49.scl, the line 555/524 ! c# 138.75 Hz is currently given a cent value of 555.0 - I've attached a screenshot from the Surge tuning editor:

The scl files in the Scala scale archive which give unexpected results for this reason are:

septenariusGG49.scl
sparschuh-442widefrench5th.scl
sparschuh-eleven_eyes.scl
sparschuh-eqbeat-fac_ceg.scl
sparschuh-gothic440.scl
sparschuh-oldpiano.scl
sparschuh-squiggle_harpsichord.scl
sparschuh-stanhope.scl
sparschuh-wohltemperiert.scl
sparschuh_53in13lim.scl
sparschuh_53tone5limit.scl
sparschuh_bach_cup.scl
sparschuh_dyadrat53.scl

There's also some cases from the tuning mailing list, for example here, here, and here.

I made a local tuning-library change to handle end-of-line comments so I thought I'd make a PR with it in case it's useful.

[baconpaul]

Oh fantastic, thanks!