The current implementation matches libreoffice-oldstable when testing for libreoffice.
So uninstalling libreoffice fails when libreoffice-oldstable is installed.
```
PS C:\WINDOWS\system32> choco list --local-only libreoffice
Chocolatey v0.10.3
libreoffice-oldstable 5.2.6
1 packages installed.
PS C:\WINDOWS\system32> choco list --local-only --exact libreoffice
Chocolatey v0.10.3
0 packages installed.
```
The solution is easy, just add `--exact`.
When using state=latest with the package not being installled, Ansible complains that the package is not installed and fails the task.
Whereas the expected behaviour is to install the package when it is missing.
This PR fixes this behaviour.
Changes include:
- Use Get-AnsibleParam with -type/-validateset
- Replace $result PSObject with normal hash
- Deprecate 'upgrade' parameter by using state=latest