wifi: rework (re)connection and softAp logic

Immediatly try to connect when reloading settings and previous attempt
had failed. Because of locking, previously this caused a soft-lock of the
internal loop that required waiting for the long Reconnect timeout to
expire first.

Refactor the module to include namespace { ... } and move build settings into .cpp
Saves ~1.5Kb and also allows gcc to issue unused warnings for declared functions.

As a side-effect of refactoring, (temporarily?) remove softAp leases support.
Current Core moved dhcps support into a C++ code, forcing internal logic
to reference a specific object. Better to wait a bit until that
stabilizes and try again. Plus, it is not currently available in the esp-idf.

CHANGELOG.md

@@ -154,7 +154,6 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Kingart curtain switch UI support ([#2250](https://github.com/xoseperez/espurna/issues/2250), thanks to **[@echauvet](https://github.com/echauvet)**)
 - Refactor WS implementation, add some comments to the header ([#2261](https://github.com/xoseperez/espurna/issues/2261))
 #### WiFi
-- SoftAP DHCP leases ([#2320](https://github.com/xoseperez/espurna/issues/2320))
 - Try to connect to a better AP, when the current RSSI is below -73dBm (only when WiFi scanning is enabled).
 #### Relays
 - Support multiple provider types (GPIO, virtual, IO expanders, etc.)

code/espurna/config/general.h

@@ -588,11 +588,6 @@
                                                            // By default or when empty, admin password is used instead.
 #endif
 
-#ifndef WIFI_AP_LEASES_SUPPORT
-#define WIFI_AP_LEASES_SUPPORT      0                      // (optional) Specify softAp MAC<->IP DHCP reservations
-                                                           // Use `set wifiApLease# MAC`, where MAC is a valid 12-byte HEX number without colons
-#endif
-
 #ifndef WIFI_AP_CHANNEL
 #define WIFI_AP_CHANNEL             1
 #endif