Added ability to control switches

[lmatter]

switch is a reserved word, so I spelled the iterator swytch.

[landonr]

nice work! this fixes #22

1. can we use switchObject instead of swytch to keep everything plain english?
2. the linter didnt run but I got a warning in esphomeRemote.h for an unhandled switchesMenu in a switch statement
3. can you add an example to the sharedRemoteConfig.yaml like

 ## Home assistant switches. Set with a friendly name
 - lambda: |-
     std::vector<FriendlyNameEntity> switches { 
       FriendlyNameEntity("switch.oven_fan", "Oven Fan")
     };
     switchGroup = new SwitchGroupComponent(displayUpdate);
     switchGroup->setup(switches);
     return {switchGroup};
   id: switch_group_component```