updated colors in light, dark and theme files, in template file basic colors uses variables from dark/light files, also changed  to -basic in some files

* Fix prettier version to 1.16.4

graph2 should use ReactPanelPlugin from @grafana/ui

Surrounded Switch with div to restrict size

fix native annotation filtered by template variable with pipe

fix: Remove tab param from url when leaving edit mode

Fixes #15505

Fixed navbar backbutton padding

[wip]Cleaning up the theme .scss files 

Updated explore icon and style tweaks

Fixing array direction, adding simple render test

Lowered icon size and improved paddings, tried to align placement between dashboard and explore

Fixed unit test and updated gauge
Added migration for threshold order

Datasource docs for Loki

cli: chmod 755 for backend plugin binaries

Fixes #15477

Fixes #15500. Does a simple filename check if the binary names ends
with _linux_amd64 or _darwin_amd64 then sets the file mode to 755.