NetScaler terraform refactor

[LooseDevGoose]

Rework / Removals:
-Remove remote modules, make modules local
-Rework module structure
# contains all netscaler vsphere deployment code
-vpshere.netscaler.deployment

# contains all base configuration / best practice values / vservers / gateway etc
-netscaler.base.configuration

# Contains all letsencrypt related setup (including vservers)
netscaler.letsencrypt

-Reworked variable structure / names
-Removed string concatenation on complex variables
-Removed wait timers
-Removed time module
-Squashed endpoint resources
-Renamed all variables to match the other Terraform deployments

Fixes:
-Fixed reapply errors regarding the default timezone
-Fixed reapply errors when (re)defining an SSL profile

Additions:

-Included type checking on all (NetScaler related) variables. Security is all the rage.

-Incorperate object instead of maps for improved data structure.

-Included best practice of using tfvars file. Added a fully populated one for example config.

-Included license logic: you can also deploy a non-licensed (/freemium) netscaler now, and the configuration logic will adapt.

-Traveled the seven seas of NetScaler API documentation and optimized code logic flow (with appropiate pirate drinks).

-AAA vServer added

-Advanced authentication added

-Gateway now authenticates via auth profile with the AAA vserver

-Firmware versions 13.1 & 14.1 now supported.

-Virtual Servers / Services / and server objects no longer created through abstract looping; new structure with object mapping improves readability, scaling and debugging capability.. and other buzzwords the marketing people love.

Configuration changes:

-Enabled HTTP/2 on HTTP Profile
-Enabled Strong Password enforcement