Feature/language tiny matrices

Also add related tests

Deal with missing tests of
- ASTNodeListAffectationExpressionBuilder
- FunctionArgumentConverter
- FunctionProcessor
- ListAffectationProcessor

- use ASTNodeNaturalConversionChecker<AllowRToR1Conversion> when dealing with lists
- ASTNodeNaturalConversionChecker call in ASTNodeBuiltinFunctionExpressionBuilder

- deal with arguments as well as return value
- add few missing tests

- add also missing tests
- improve slightly error messages

- fix tuple affectation for none list rhs
- fix affection for R^1x1

Testing for `ASTNodeNaturalConversionChecker` remains incomplete

- (re?)-check that list to tuple conversion is possible
- fix an issue in affectation of matrix tuple elements from lists

It has now the same behavior as TinyVector

This commit namely adds tuple to matrices conversions and allows to
deal with product of spaces containing R^dxd

This gives better information when running into problems

- allow affectation of TinyMatrix to string
- allow concatenation of TinyMatrix to string

Grant functionalities (by now)
- declaration of variables of type R^1x1, R^2x2 and R^3x3
- allow standard affectations
- add unary minus operator
- plug basic binary operators