[TASK] Shift to internal recursive array merge in inheritance
[TASK] Expand returned field array to variable then return
[FEATURE] Finer inheritance settings on every Flux field type

This feature adds two new attributes to every Flux field:

* inherit (integer, used only as boolean currently)
* inheritEmpty (boolean)

Setting these attributes will affect how each field is processed when parsing the root line of records that make up an inheritance tree. By setting `inherit="0"` you can prevent the particular field form inheriting its value - and by setting `inheritEmpty="TRUE"` you can allow empty (but non-zero) values to be inherited.

The reason for always allowing inheritance of a true zero value is that this particular value is often used as a "none" value rather than a value which should be overridden by a parent value.

Fixes: #36
[TASK] Allow zero to be considered non-empty in inheritance
[BUGFIX] Don't think an integer is a boolean
[BUGFIX] Use correct name "inheritEmpty" when reading value
[TASK] Avoid empty field when saving empty sheets
[FEATURE] Property "clear" (boolean) on every Field ViewHelper

Setting this property to TRUE displays a "clear value" checkbox next to the field. Checking this box completely destroys the value.

Must be manually specified for fields which should support such behavior.
[BUGFIX] Inconsistent assignment of template variables

This fixes an issue with variables which are resolved to be inserted in the View. Before, variables would never contain the ones defined in the flexform. After, the flexform variables are used if they contain a "settings." prefixed array.

Fixes: https://github.com/FluidTYPO3/fluidcontent_bootstrap/issues/37
Fixes: #121
Merge pull request #43 from FluidTYPO3/claus/inheritance

[FEATURE] Finer inheritance settings on every Flux field type
Merge pull request #129 from NamelessCoder/missingflexformvariables

[BUGFIX] Inconsistent assignment of template variables
[FEATURE] Support settings.useTypoScript natively in Flux controllers
[BUGFIX] Assign values of fields not prefixed with "settings"