added config.filters_config module with HardcodedFiltersConfig class
several changes; this closes #1

-adjusted filter hardcoding
-fixed bug in filterwheel driver (thorlabs_fw102c module)
-added filterwheel simulation (thorlabs_fw102c_sim module)
-removed buggy GratingsConfig (I should probably test things before
committing to master, in the future)
-added filter checking and changing to Acquirer (acquirer module)
Merge branch 'feature-auto-select-filter'