Based on #62896, only implements the BPM support part.
* Implements BPM support in the AudioStreamOGG/MP3 importers.
* Can select BPM/Bar Size and total beats in a song file, as well as edit looping points.
* Looping is now BPM aware
* Added a special importer UI for configuring this.
* Added a special preview showing the audio waveform as well as the playback position in the resource picker.
* Renamed `AudioStream::instance` to `instantiate` for correctness.
* 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!
These typedefs don't save much typing compared to the full `Ref<Resource>`
and `Ref<RefCounted>`, yet they sometimes introduce confusion among
new contributors.
Removes some unnecessary includes from `editor_node.h`, and instead add
those where they're used.
Removes unnecessary `editor_node.h` includes in various editor classes.
Renames `dynamicfont` to `dynamic_font` in a couple files.
Misc cleanup while jumping through that rabbit hole.
When clicking on a resource field in the inspector dock, you now have
the "Quick Load" option in addition to "Load". This opens a QuickOpen
dialog allowing the user to type in a phrase to quickly locate the
desired resource (similar to "Quick Open Scene").
In my experience, this is much faster than clicking through the File
Dialog.
Relates to godotengine/godot-proposals#346.
* LineEdit popups created on demand.
* TextEdit popups created on demand.
* SpinSlider popups created on demand.
* ResourcePicker popups created on demand.
Improves editor responsiveness.
