* Map is unnecessary and inefficient in almost every case.
* Replaced by the new HashMap.
* Renamed Map to RBMap and Set to RBSet for cases that still make sense
(order matters) but use is discouraged.
There were very few cases where replacing by HashMap was undesired because
keeping the key order was intended.
I tried to keep those (as RBMap) as much as possible, but might have missed
some. Review appreciated!
* Adds `indent(str)` to `String`:
* Indent the (multiline) string with the given indentation.
* This method is added in order to keep the translated XML correctly
indented.
* Moves the loading of tool/doc translation into
`editor/editor_translation.{h,cpp}`.
* This will be used from both `EditorSettings` and the doc tool from
`main`.
* Makes use of doc translation when generating XML class references, and
setup the translation locale based on `-l LOCALE` CLI parameter.
The XML class reference won't be translated if `-l LOCALE` parameter is
not given, or when it's `-l en`.
