Dhii/expression-renderer-abstract

# Dhii - Expression Renderer Abstract

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## Details
Abstract functionality for objects that can render expressions.

### Traits
- [`RenderExpressionTrait`] provides the basic functionality for reading an expression from a render context and passing
it on to an abstracted render method.
- [`RenderExpressionAndTermsCapableTrait`] provides functionality for rendering an expression's terms in sequence, then
compiling those results into a final render. The provided `_renderExpressionAndTerms()` method can be used to
complement `renderExpression()` in [`RenderExpressionTrait`].
- [`DelegateRenderTermCapableTrait`] provides functionality for rendering an expression or term by passing it onto a
delegate renderer, via an abstract delegate renderer getter method. The provided `_delegateRenderTerm()` method can be
used to complement `renderExpressionTerm()` in [`RenderExpressionAndTermsCapableTrait`].
- [`GetTermTypeRendererContainerTrait`] provides functionality for retrieving a renderer that corresponds to a term's type
from a container instance. The provided `_getTermTypeRenderer()` method can be used to complement
`getTermDelegateRenderer` in [`DelegateRenderTermCapableTrait`].
- [`OperatorStringAwareTrait`] provides awareness of an operator string via storage and retrieval methods.


[Dhii]:                                                 https://github.com/Dhii/dhii

[`RenderExpressionTrait`]:                              src/RenderExpressionTrait.php
[`RenderExpressionAndTermsCapableTrait`]:               src/RenderExpressionAndTermsCapableTrait.php
[`DelegateRenderTermCapableTrait`]:                     src/DelegateRenderTermCapableTrait.php
[`GetTermTypeRendererContainerTrait`]:                  src/GetTermTypeRendererContainerTrait.php
[`OperatorStringAwareTrait`]:                           src/OperatorStringAwareTrait.php