tweak String Literals EscapeSequence

The documentation claimed `\ EndOfFile`. This is wrong though because "EndOfFile" is a set of values, and not actual printable characters. The correct escape here is simply `\0`.
Add documentation for isNested trait.
fix Issue 8959 - IsExpression should support syntax which has no Identifier in all cases
Fix runable examples: Strip whitespaces and newlines while computing md5sum
Merge branch 'run-main' into run-main2
Merge pull request #298 from nazriel/run-main2

Fix run able examples
Per https://github.com/D-Programming-Language/d-programming-language.org/pull/297
Per https://github.com/D-Programming-Language/d-programming-language.org/pull/297
Update predefined versions

* Consistent naming: SoftFP --> SoftFloat (on ARM SoftFP != SoftFloat)
                     HardFP --> HardFloat
* DOC: ARM_Thumb means any Thumb version
* ARM/ARM64 fix reference regarding AARCH (AARCH is an arm8 term
  but ARM is also defined for ARM7,6,5...)
* Rename ARM64 to AArch64 which is the official name
* Remove MIPS: MIPS is the same as MIPS32, MIPS32 is
  the official name
* Remove MIPS_NoFloat: This should be a generic version D_NoFloat
  or it shouldn't be defined at all.
* D_X32: Add a note that defining both D_X32 and X86_64 is
valid/expected
* D_LP64: We only talk about pointers, this is not the C LP64 data
model!
Merge pull request #289 from monarchdodra/master

 	tweak String Literals EscapeSequence
Merge pull request #243 from jpf91/versym

Update predefined versions
Add a better Template This feature example.
Merge pull request #300 from AndrejMitrovic/TemplateThis

Add a better Template This feature example.