Avoid undefined index in startup/process routing

Avoid undefined index in startup/process routing

- Append `isset()`s
Defining PermissionAccessListItem properties

Defining PermissionAccessListItem properties

These were likely meant to be protected, but I am only working on notice
supression and since these were previously implicitly public I'm just
staying with what they were previously to avoid introducing new issues.
Declare `Permission::$error`

Declare `Permission::$error`

Staying with implicit public declaration, but this is possibly meant to
be private
Remove intval and clarify conditional

Remove intval and clarify conditional

`intval($cvID) > 0` is identical to `$cvID > 0`
Avoid undefined index in Login Controller

Avoid undefined index in Login Controller
Define `$method` before conditional

Define `$method` before conditional
Declare `Controller::renderOverride`

Declare `Controller::renderOverride()` public to align with implicit
public declaration
Check for $pageDescription defined

Check for $pageDescription defined before checking its value
Merge pull request #1399 from mkly/get_stricter_2

Get stricter 2
Revert View::getInstance declaration

Revert View::getInstance declaration

Issue with `Config::get()` and `isset($this)`