Zoom level and null pointer fix (#70)

* catch exceptions while parsing and fix poliline on mobile

* add missing return

* initial draft on iOS

* add symbol methods to controller

* parse symbol

* implement useCourseSymbolOnMovement

* implement new type of location display data source

* implement feature

* implement feature

* add example on button click

* add support for local asset android

* add support for local asset android

* fix logic

* implement iOS

* reformat

* review

* update README.md and add button for example only on mobile

* finish iOS location indicator impl

* export

* implement android

* merge indicator

* fix android

* try to fix wrong initial scale

* implement licenseKey and make apiKey optional

* print statement

* try to fix zoom

* fix zoom gets not initialized correctly

* remove print

* fix android error parsing symbol and iOS zoom

* fix bug for manual location source on android

* revert changes

* typo

* fix NaN android getMapScale

* fix

* correct round

* remove web sdk

* format

* fix merge

* fix ios build

* remove duplicate declaration

* stabilize method calls

* fix

* merge all-features branch into here and remove ignoring web

* remove unnecessary newline

* correctly catch futures

* cleanup code on android

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Co-authored-by: Julian Bissekkou <[email protected]>