Added ability to use custom map styles

[mak001]

Added custom marker icon support

Relies on dynamic/silverstripe-geocoder#24 and dynamic/silverstripe-locator#185

[codecov]

Codecov Report

Merging #19 into master will decrease coverage by 0.38%.
The diff coverage is 92.85%.

@@             Coverage Diff              @@
##             master      #19      +/-   ##
============================================
- Coverage     94.87%   94.49%   -0.39%     
  Complexity       11       11              
============================================
  Files            26       26              
  Lines           449      472      +23     
  Branches         78       85       +7     
============================================
+ Hits            426      446      +20     
- Misses           23       26       +3

Flag	Coverage Δ	Complexity Δ
#js	93.76% <91.17%> (-0.36%)	0 <0> (ø)
#php	100% <100%> (ø)	11 <0> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
client/src/js/actions/ActionTypes.js	100% <100%> (ø)	0 <0> (ø)	⬇️
client/src/js/components/Locator.jsx	100% <100%> (ø)	0 <0> (ø)	⬇️
client/src/js/actions/settingsActions.js	100% <100%> (ø)	0 <0> (ø)	⬇️
src/Extensions/LocatorControllerExtension.php	100% <100%> (ø)	10 <0> (ø)	⬇️
client/src/js/reducers/settingsReducer.js	100% <100%> (ø)	0 <0> (ø)	⬇️
client/src/js/components/map/Map.jsx	89.47% <60%> (-10.53%)	0 <0> (ø)
client/src/js/components/map/MapContainer.jsx	91.66% <66.66%> (-2.62%)	0 <0> (ø)

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