Ned/reduce memory usage

[ned-pcs]

This PR allows running Micropython-ESP-WiFi-Manager on an ESP32 without SPI RAM.
Doing this requires pre-compiling static resources (see below).
It changes the string concatenation that was being used for formatting the discovered networks into HTML into utemplate iteration and inclusion.
It also allows for static resources to be compiled into frozen strings using mpy_bin2res.py (this requires pkg_resources from micropython-lib).
The code for serving static resources has been unified and simplified (which required moving static/favicon.ico into static/ico).
It also vendors microdot files directly from github:miguelgrinberg.

Full change list:

    Render network list using included template rather than string appending.
    
    Use utemplate iteration for select.tpl
    Add _tpl.py files to flake8 exclude list
    Ignore pre-compiled templates and .vscode dir
    Removed (board-dependent) LED stuff from boot.py
    Delete two unused templates.
    Add simpler static server method.
    Search for static files in pre-compiled bytecode modules
    Allow for frozen pre-compiled templates to be used instead of ones from the filesystem
    Change spelling of Passwort => Password
    Add boot.py and main.py under lib/wifi_manager.
    Also add instructions as to how to invoke the logic of these files from your own /boot.py and /main.py.
    Move favicon.ico under static/ico for consistent searching.
    Add garbage collect before every request.
    Add aiorepl to run().

[codecov-commenter]

Codecov Report

Merging #33 (8fa1fb2) into develop (d911e69) will not change coverage.
The diff coverage is 52.83%.

❗ Your organization is not using the GitHub App Integration. As a result you may experience degraded service beginning May 15th. Please install the Github App Integration for your organization. Read more.

@@           Coverage Diff            @@
##           develop      #33   +/-   ##
========================================
  Coverage    68.32%   68.32%           
========================================
  Files           21       21           
  Lines         1364     1364           
  Branches       194      194           
========================================
  Hits           932      932           
  Misses         392      392           
  Partials        40       40           

Flag	Coverage Δ
unittests	68.32% <52.83%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
wifi_manager/wifi_manager.py	56.09% <52.83%> (ø)

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[brainelectronics]

relates to micropython/micropython#11764

[brainelectronics]

Looks good so far, could you please fix my remarks and add a changelog entry similar to the previous ones? The version would be 1.13.0 I assume as this is nice feature and not just a fix :)

[ned-pcs]

OK @brainelectronics I think I addressed everything you mentioned. How does it look?

[brainelectronics]

LGTM, I've published the https://test.pypi.org/project/micropython-esp-wifi-manager/1.13.0rc18.dev33/ to Test PyPI. It contains your latest changes.
May you have also the possibility to test it on MicroPython 1.19.1 with upip? I'm currently not at home, so testing can be done on Friday from my side.

[brainelectronics]

Hey @ned-pcs , I've merged #35 to add the pkg_resources also for older upip users. Everything got tested successfully today. So one more rebasing and this great PR can be merged 🎉