updated codebase to only have 3 modules: server, client and common. This is instead of having a module per sub-directory which is unecesseray bloated

Updated installation details in tools/distribs_install.md

Added distribs_install.md which describes what to setup/install when creating base images for various linux distributions.

Added guest agent settings to vm_run and template_creator

Added options "discard=unmap,detect-zeroes=unmap" to QEMU in order to handle sparse files to save disk space.
Updated template_creator, update_disk and vm_run scripts in consequence.

Updated template_creator: template dir wasn't removed after archive was created
Updated README.md with vm_run

Overhauled template_creator which now creates a full template that can directly be unarchived in the templates directory.
Updated README.md accordingly.

Fixed a minor bug in qemu.go
Removed sound option in template_creator

Updated README.md to add how to create an initial template and also how to create the initial user hashed password

- Added tools/genpwd which encrypt plain password for use with nexus