@TD-er got build problem:

/home/users/linaja/ESPEasy-mega_test/src/__CPlugin.ino: In function 'void CPluginInit()':
/home/users/linaja/ESPEasy-mega_test/src/__CPlugin.ino:19:100: error: invalid conversion from 'boolean (*)(byte, EventStruct*, String&) {aka unsigned char (*)(unsigned char, EventStruct*, String&)}' to 'bool (*)(byte, EventStruct*, String&) {aka bool (*)(unsigned char, EventStruct*, String&)}' [-fpermissive]
#define ADDCPLUGIN(NNN) if (x < CPLUGIN_MAX) { CPlugin_id[x] = CPLUGIN_ID_##NNN; CPlugin_ptr[x++] = &CPlugin_##NNN; } else addLog(LOG_LEVEL_ERROR, FPSTR(ADDCPLUGIN_ERROR));
^
/home/users/linaja/ESPEasy-mega_test/src/__CPlugin.ino:108:3: note: in expansion of macro 'ADDCPLUGIN'
ADDCPLUGIN(019)
^

Did you rebase it all?

I did change the boolean return value to bool for the CPlugin.
I have to go in a minute, so maybe you can see if I forgot to commit something?

@TD-er ok sorry it was my plugin not changed to bool ;)

@TD-er be sure more plugins not official (like my Nettemp support) will report now this issue, error is not straightforward to find because of macro used here ;)

That's why I didn't change it for the plug-in macro yet

personally I would change it, but after stable release, it is not a big deal and consequences are bigger as it is hard to find compilation time issue

Yep, I agree.
Since there aren't many 'controllers' in the wild, I thought it wouldn't be such an issue, but for plugins it's much more of an issue.