C++ Wrapper plans

## Functional
`C` is when the function is imported in `Imports.h`, `I` is when the function is imported in the public API, `E` is when it's exported from the kernel. `-` means that the feature will be implemented after the branch is merged into master, `T` is when it's tested.
```
- [CIET] ToString
- [CIET] Latex
- [CIET] FromString
- [CIET] Differentiate
- [CIET] Integrate
- [CIET] Limit
- [CIE ] Node-creating functions
- [CIET] Nodes
- [CIET] Vars
- [CIET] Vars and constants
- [CIET] Alternate
- [CIET] Simplify
- [CIE?] Evaluate
- [CIE?] InnerSimplified
- [CIET] ToLong
- [CIET] ToRational (a pair of longs)
- [CIET] ToDouble
- [CIET] ToComplex
- [ - ] Matrix (from vector of vectors of entities)
- [ - ] Transpose
- [ E ] FiniteSet to vector
- [ ] Compilation?
- [ E ] ==, !=, >, <
- [CIE ] Solve
- [CIE ] SolveEquation
```