globalvar 0.2.0

# globalvar

## usage

### kv

1. `init_global_var`
2. `fetch_global_var`
3. `fetch_global_var_mut`
4. `drop_global_var`

### ptr

1. `def_global_ptr`
2. `get_global`
3. `get_global_mut`
4. `undef_global_ptr`