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0.1.23 changelog

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## V 0.1.23
*30 Nov 2019*
The last release before 0.2.
- Direct x64 machine code generation. Hello world being built in 3 milliseconds.
- Bare metal support via the `-freestanding` flag, allowing to build programs without linking to libc.
- Lots of fixes in Generics,.
- vweb framework for developing web applications is back.
- Vorum, the forum/blogging software written in V/vweb, can now be compiled and has been added to CI.
- REPL, `v up` have been split up into separate applications to keep the core V compiler small.
- V now enforces short enum syntax (`.green` instead of `Color.green`) when it's enough.
- V UI for macOS.
- Interfaces have been rewritten. `[]interface` support.
- `os.cp()` for copying files and directores.
- Additional compile-time flags: `$if clang, msvc, mingw, x32, x64, big_endian, little_endian {`.
- All C functions now have to be declared, all missing C functions have been defined.
- Global variables (only with the `--enable-globals` flag) for low level applications like kernels and drivers.
- Nothing can be cast to bool (previously code like `if bool(1) {` worked.
- `<<` and `>>` now work with all integer types.
- V detects Cygwin and shows an error. (V supports Windows natively)
- Improved type checking of some operators (`%, |, &` etc).
- Windows 7 support.
- `println(true)` now prints `true` instead of `1`.
- `os.exec()` now uses `CreateProcess` on Windows.
- fast.vlang.io website for monitoring the performance of V after every commit.
- On Windows Visual Studio is now used automatically if GCC is not installed.
- vfmt!
- Lots of cleaning up in the compiler code.
- Multi-level pointers in unsafe code (`****int`).
- MSVC backtrace.
- `$if os {` blocks are now skipped on a different OS.
- C string literals (`c'hello'`).
- AlpineLinux/musl fixes + added to CI.
- Inline assembly.
- Clipboard module (Windows, macOS, X).
- `foo()?` syntax for error propagation.
- Docs have been migrated from HTML to `doc/docs.md`.
## V 0.1.22
*28 Oct 2019*