api: allow lights.read() to be filtered by light names (#271)

## Link to GitHub Issue, if one exists
Fixes https://github.com/spice2x/spice2x.github.io/issues/179

## Description of change
Previously, lights.read() did not accept any parameters, instead it
returned all lights implemented by the current game.
Problem is that this is too large for some embedded implementations;
also just inefficient.

Add code to accept light names as strings and only return those in the
result.
For performance, use `robin_hood::unordered_map` to speed up the lookup
operation, which was previously a linear search.
Add this to Python wrapper library. Did not bother with others.

Also, as a bonus - update lights.write_reset() to also accept a flat
list of strings, as opposed to array containing a string, which was
silly.

## Compiling
➕ 

## Testing
Tested using spiceremote and writing a short Python program.

src/spice2x/README.md

@@ -181,6 +181,12 @@ All of those three modules have equally named methods for you to call.
   - removes the override value from the objects specified by name
   - if no names were passed, all overrides will be removed
 
+##### Additional API for lights
+- read(name: string, ...)
+  - same as read(), but you can specify light names
+- write_reset(name: str, ...)
+  - same as write_reset(), but it accepts a flat list of strings
+
 #### Touch
 - read()
   - returns an array of state objects containing id, x and y
@@ -252,6 +258,12 @@ which also means that your hex edits are applicable directly.
 - image_resize_set_scene(scene: int)
   - sets the active scene for image resize state; set to 0 to disable resize
 
+## Native wrapper libraries
+Spicetools provides wrapper libraries in: Arduino, C++, Dart, and Python.
+Python is the only one that is fully spec compliant.
+Other libraries may be missing features and contain bugs; please feel free to
+contribute code to fill the gaps if you work on a project using these libraries.
+
 ## License
 Unless otherwise noted, all files are licensed under the GPLv3.
 See the LICENSE file for the full license text.