GitLab

This reverts commit c0e55fb6.

This fixes a number of issues seen with timed inputs (as tested in test
11 of etude.z5), in particular:

* If an interrupt made no on-screen changes, the input would not be
  resumed at the same place, but be reprinted at the start of a new line
* If the input being resumed spanned more than 1 screen line, the input
  position was incorrect and crashes could occur
* The cursor position was not preserved when resuming a timed input,
  making editing very frustrating
* MORE was not activated if nothing was typed and a screenful of output
  had been produced

This can be seen in corruption to the output of option 3 in etude.z5

This fixes a crash & all objects tests in CZECH.z5

This fixes 1 tables test in praxix.z5

This fixes 3 streamtrip failures in praxix.z5

This fixes 1 specfixes test in praxix.z5

This fixes 16 indirect tests in praxix.z5

This fixes 21 shift tests in praxix.z5

This fixes 14 shift tests in praxix.z5

This fixes 34 shift tests in praxix.z5

This fixes multi-line timed input resumes

This version (with a partial implementation of the ZX Spectrum Next IO
module) was demoed at PLAY Expo Manchester 2019.

zxzvm-next.bas is the standard loader, pre-installed for use in C:/ZXZVM,
and with commands added to force layer 0 mode and 14MHz speed.

zxzvm-next.ext is the same, modified to be run by the Browser with the
filename to load in f$. This can be used by adding the following line
to c:/nextos/browser.cfg:

Z?:clear 26623:let f$="|":merge "c:/zxzvm/zxzvm-next.ext":goto 8000