Create headers and use m4 to include them

PLASMA/src/stdlib.plh

@@ -0,0 +1,16 @@
+import stdlib
+  predef cls, gotoxy, viewport, putc, puts, getc, gets, syscall, romcall
+  predef heapmark, heapallocallign, heapalloc, heaprelease, heapavail
+  predef memset, memcpy, memxcpy
+  predef isugt, isuge, isult, isule
+  predef exec
+  ;
+  ; System flags: memory allocator screen holes.
+  ;
+  const restxt1     = $0001
+  const restxt2     = $0002
+  const reshgr1     = $0004
+  const reshgr2     = $0008
+  const resxhgr1    = $0010
+  const resxhgr2    = $0020
+end

PLASMA/src/testlib.plh

@@ -0,0 +1,9 @@
+import testlib
+  predef puti, putln
+  word print
+  const dec = 0
+  const hex = 2
+  const newln = 4
+  const str = 6
+  const char = 8
+end