reCAPTCHA, search view and more

[FEATURE] Added possibility to set recursive storagePage
[FEATURE] Add TS Settings for Categories and Locations - #255
[FEATURE] Add reCAPTCHA option to registration form #264
[FEATURE] Added unique e-mail address check for registrations #45
[FEATURE] Added search view #139

[TASK] Set partialRootPath to e-mail View
[TASK] Hide unnecessary fields in BE for the plugin
[TASK] Add displayCond for recursive option #258
[TASK] Save FE language on registration #261
[TASK] Implement language field to standalone view #262
[TASK] Add fe_user relation to registration #263
[TASK] Moved Plugin registration to TCA overrides #269
[TASK] Adjusted size of date fields #270
[TASK] Added SearchDemand Object #139
[TASK] Update documentation #266