PlugData integration (https://plugdata.org/).

Add support for Apple silicon Macs and pkg-config lua.

Disabled some compilation options which prevented compilation on Apple
silicon Macs (M1, M2, etc.).

Lua header files and libraries are located using pkg-config now, to
better accommodate different build environments. There's also a new
`static` option to link against the static Lua library, which is
useful if the target system doesn't have the dynamic Lua library
installed. To do this, invoke make as `make static=yes` (of course,
you'll need to have liblua.a installed to make this work).

If pkg-config fails to locate the Lua header files and libraries, you
can still use LUA_CFLAGS and LUA_LIBS to point make to the right
locations. E.g., the following should work on most Unix-like systems
if Lua is installed in the standard location:

LUA_CFLAGS = -I/usr/include/lua
LUA_LIBS   = -llua

Tutorial text changes, add a note about installing the improved live-…

…coding support.

Version bump.

Update version number and copyright

macOS/MacPorts compatibility

Upstream version 0.7.3

pd-lua Debian release 0.7.3-1

pd-lua Debian release 0.6.0-2

Upstream version 0.6.0