fix MinGW build with posix threads

latest deps, thread name fixes:

- return error if name cannot be set
- fix getting of names on android

unique_ptr context (executor owns context)

LocalExecution
ExecutionContext::running
finalize in calling thread
new code formatting

Minor:

- Compact copyright notice in sources
- ALIAS CMake target xec::xec
- Latest deps

- Added GetThreadName

- Shared pointer execution contexts
- Clear tasks when finalizing to prevent dangling refs
- Allow external contexts in ThreadExecution
- Proper non-MSVC exports
- Minor style fixes

- Allow delayed setting of execution context

- Optimize TaskManager with task double-buffering
- Remove NoopExecution from lib as it's only useful for tests
- Latest versions of CPM.cmake and packages

Task rescheduling

Allow ThreadExecution to join the thread without calling stop

Added cancellation tokens of tasks in TaskExecutor

- ThreadExecutionContext no longer internal

- Latest icm