[!!!][+BUGFIX] Fluid (View): Adjust fluid to recent resolveView() backport

Tx_Fluid_View_AbstractTemplateView now implements the Tx_Extbase_MVC_View_ViewInterface that was changed in r2675.
NOTE: This is a breaking change because the API method Tx_Fluid_View_TemplateView::hasTemplate was renamed to canRender(). Besides I deleted the TemplateViewInterface that is no longer needed. Implement Tx_Extbase_MVC_View_ViewInterface or simply extend Tx_Fluid_View_AbstractTemplateView if you want to write your own view implementation

Relates to: #8990