[TYPO3-mvc] naming issue: prefixedExtensionKey vs argumentNamespace vs prefix vs designator

[Steffen Kamper]

Hi Jochen,

please don't mix naming

extensionName="myext"
is wrong as extensionName is different to extensionKey, and this one 
here is with stripped "_"

pluginKey is wrong also as it's the appendix of classname

I also think that such naming is very confusing: what is extension, what 
is plugin etc.

The additionalParams should be in for freedom of adding any additions.

vg Steffen