ucode: update to latest Git HEAD

ucode: update to latest Git HEAD

e14b099 syntax: implement support for ES6 template literals
111cf06 vm: stop executing bytecode on return of nested calls
33f1e0b treewide: move json-c compat shims into internal header file
e0e9431 vm: move unhandled exception reporting out of `uc_vm_execute_chunk()`
2b59140 vm: fix callframe double free on unhanded exceptions
7d7e950 main: abort when failing to load a preload library
1032a67 lib: let `json()` accept input objects implementing `read()` method
5ee68d5 fs: implement `fs.readfile()` and `fs.writefile()`
df6b861 ci: debian: change path before attempting to invoke Git operations
dfaf05a ci: debian: automatically update changelog from Git tag
34f3c45 ci: fix YAML syntax of Debian workflow
e956bcf fs: fix off-by-one in fs.dirname() function
6fc4b6c .gitignore: fix overmatching patterns, blacklist cram .venv
7c2e082 build: remove legacy json-c check
77942af build: add polyfills for older libjson-c versions
0b4aaa3 CI: build Debian package
f404285 debian: Add package definition
a37f654 types: fix escape sequence encoding of high byte values in JSON strings
aae5312 Update README.md
8134e25 build: fix symlink install target
87c7296 treewide: replace some leftover "utpl" occurrences, update .gitignore
7d27ad5 build: only stage ucc symlink if compile support is enabled
171402f lib: add date and time related functions
8b5dc60 lib: provide API function to obtain stdlib function implementations
eb0d2f1 main: turn ucode into multicall executable
28ee7e1 uloop: add support for tasks
753dea9 CI: build on macOS
668c5c0 lib: add argument position support (`%m$`) to `sprintf()` and `printf()`
ab46fdf treewide: remove legacy json-c include directives
b8f49b1 tests: 21_regex_literals: generalize syntax error test case
fd2e5e7 tests: 16_sort: fix logic flaw exposed on OS X
2c71bf2 tests: run_tests.sh: pass dummy value to `-T` flag
55c4a90 lib: disallow zero padding for %s formats
0d05cb5 tests: run_tests.sh: use greadlink if available
271e520 resolv: make OS X compatible
d13c320 fs: avoid Linux specific sys/sysmacros.h include on OS X
33397a3 uloop: use execvp() on OS X
bafdc8f lib: add naive sigtimedwait() stub for OS X
ada1585 build: consolidate CMakeLists.txt and cover OS X deviations
befbb69 include: add OS X compatible endian.h header
49838a8 include: rename include guards to avoid clashes with system headers
91f65de nl80211: add missing attributes and correct some attribute flags
b4a1fd5 lib: adjust require(), render() and include() raw mode semantics
4618807 main: rework CLI frontend
73dcd78 lib: fix potential integer underflow on empty render output
c402551 vm: fix crash on object literals with non-string computed properties
efe8a02 syntax: support add new operators
078d686 ubus: add event support
6c66c83 ubus: refactor error and argument handling
1cb04f9 ubus: add object publishing, notify and subscribe support
0e85974 uloop: clear errno before integer conversion attempts
05bd7ed types: treat resource type prototypes as GC roots
a2a26ca lib: introduce uloop binding
6b6d01f vm: release this context on exception in managed method call
1af23a9 tests: fix proto() testcase
4ce69a8 fs: implement access(), mkstemp(), file.flush() and proc.flush()

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
(backported from commits cef3e6a69c4751189e946cf2ff0e00304f9fff6e,
 0400774a1001835b912ecf2097bba1306deba9f8 and
 c59704334c4a01bc18ab489f86d4ca7d2ea3cb8f)