Modify scc to only load language features as required rather then doing all 222 in a single pass.
Since the loading of features is a fairly heavy task the savings for the majority of cases is worth it.
This is especially noticeable when working on smaller repositories.

Version 2.1.0 (with the update) vs 2.0.0 with the full load.

$ hyperfine './scc redis-5.0.2' && hyperfine 'scc redis-5.0.2'
Benchmark #1: ./scc redis-5.0.2

  Time (mean ± σ):      81.6 ms ±   5.0 ms    [User: 173.8 ms, System: 265.4 ms]

  Range (min … max):    75.5 ms …  97.1 ms

Benchmark #1: scc redis-5.0.2

  Time (mean ± σ):     124.4 ms ±   2.4 ms    [User: 168.6 ms, System: 289.1 ms]

  Range (min … max):   120.0 ms … 128.4 ms

NB this should be backwards compatible with library users as it is only enabled via the main.go file.