Added more front-end functionality

- Disabled most of html selection to prevent weird appearance via
accidental held clicking.
- Removed Save button, new button, and load button. Web application will
not currently feature saving sessions. May implement in the future.
Let's get this running now! There's also not enough room, will re design
UI later to fit all buttons.
- Gave new buttons, clear, spin, and synonym/antonym switcher IDs to
allow javascript to find them easier.
- Added more detailed comments on previously made javascript code.
- Added event listener handlers for buttons spin, clear, and
type-switcher.
- Type-switcher event not yet finished, need to finish data pass to
backend. Also need to work on backend php receiving script.
- Clicking type-switcher now changes 'action' value, this value will
tell backend whether or not we are looking for synonyms or antonyms. UI
changes as follows.
- Clicking spin button now prepares input text area string and action
value into a datatype ready to be passed to backend.