Three follow-ups after the reading game landed.
- WiFi: a "Réglages" home tile (gear) opens LISAEL_MODE_WIFI which forces
the SoftAP + captive portal up on demand (lisael_ui_goto starts them;
the screen's "Fermer" button tears them down), so the provisioning
portal can be tested/used without waiting for the station to fail.
- Lire: the content generator now also takes words that have no emoji
(optional img in the regex) -> 366 words instead of 286 (the extra
~80 are abstract words: text + spoken audio, no picture).
- Cleanup: removed 21 baked word icons that became dead weight once the
reading game started loading its pictures from the SD (~315 KB flash),
plus their declarations and gen_icons.py specs.
Clément Saillant
d8cbf35572