chore: update angular and openlayer

[kekel87]

• angular 8 and openlayer 6
• update all config files (according to angular-cli-diff)
• fix OL breaking change: postrender and prerender
• fix all examples height style
• fix lint errors
• fix Don't use 'Object' as a type. according to @type/ol
• remove on prefix for all output

BREAKING CHANGES:

• precompose, postcompose become prerender, postrender
• remove on prefix for all output, exception for native events :
  • click -> genericClick
  • select -> selectFeature
  • change -> genericChange
  • dblClick -> doubleClick

@Neonox31 / @Yakoust

[Yakoust]

Looks good to me. :+1:

[Yakoust]

@Neonox31 @dabbid can you have a look?

[dabbid]

Sounds ok for me too (except few comments), thx @kekel87