v0.12.0

Major Changes

• No more runtime lexing and arguments parsing, do lexing and parsing completely at compile time
• No more runtime package dependency except std
• No more unsafe function calls
• Removed APIs which could lead to exploitable code

API Changes

• Add spawn! and spawn_with_output macros, to allow running wait_result to get result later
• Renamed proc_var/proc_var_get/proc_var_set macros to tls_init/tls_get/tls_set macros
• Allow builtin commands and custom defined commands to be used in pipes
• Allow $[] to be used for vector variables
• Add cmd_lib::set_debug() and cmd_lib::set_pipefail() APIs to control debugging and pipefail behavior

Tests and Examples

• Add more macro tests
• Add pipes.rs converted from pipes.sh

Misc

• A bunch of code clean up, including eliminating duplicated code and unnecessary APIs