More bit fields patches

Close #3892

Instead we need NONE (0) and ANY (all orred values), if the user didn't
already defined them

We just need to pass it to DEFINE_BITMASK_OPERATORS macro

Define bit mask operators for scoped enums bitfields

MSVC doesn't allow alignment on function params.

Close #3887

shared method that exits early if everything is generated

MSVC doesn't allow alignment on function params. This prevents the copy and thus avoids this issue https://msdn.microsoft.com/en-us/library/373ak2y1.aspx

Handle \u-escaped surrogate pairs correctly in IDL parser

Change-Id: I64307ccd0a6f23a7c3860d602813e637415e7c91

Change-Id: Ie7cc268a8823aec1d06c8b7cbef54068d832de3a

Remove Remaining FBB#createString Allocation

Also removed some trailing whitespace.

Change-Id: I40bf4f776ca4d467b7ee6f2c9a7500c13700f9d5

Bug: https://github.com/google/flatbuffers/issues/3872
Change-Id: I5d551168e9bc925e867e5e4ddf5d809418fd44eb
Tested: on Linux.

eliminating the last remaining allocation in string creation

Use the build output flatc to compile test schemas by default.

Fix undefined behavior when CheckBitsFit left-shifts 64-bit value by 64 bits

Bug: 28762769
Change-Id: Iec370482f67c4585e97dd5175c1a4258ddba47fe
Tested: on Linux.

Fixed Library Location in CppUsage.md

Fixed Library Location 
"https://github.com/google/flatbuffers/tree/master/include/flatbuffers"
in CppUsage.md

Fix CreateString with already-encoded string or bytearray in Python 2.7.

Fix for #3853

Transition 1 (nice diffs) Go, C++ and General generators with class

Can now use ``CharSequence`` of ``String``.  Works with

1. [AsciiString]
(http://netty.io/4.1/api/io/netty/util/AsciiString.html)
2. [CharBuffer]
(https://docs.oracle.com/javase/8/docs/api/java/nio/CharBuffer.html)
3. [StringBuilder]
(https://docs.oracle.com/javase/8/docs/api/java/lang/StringBuilder.html)

Go: Fix heap allocation when reading a string.

Fix for #3849