SpecTalkZX 1.4.2: Triton

SpecTalkZX 1.4.2 Triton runs straight from the web on the Spectranext cartridge
again. Classic ZX and native Spectrum Next behave as in 1.4.1; only the version
number changes there.

Highlights:

• Spectranext: choose Load Resource URL and enter
  https://ignaciomonge.github.io/spectalkzx/. SpecTalkZX starts without
  being installed, after a short loading screen that any key skips.
  Configuration and bookmarks stay in the cartridge under /CFG.
• To install it for use without the web, enter
  https://ignaciomonge.github.io/spectalkzx/install/ instead, then start
  SPCTX.ZX from local storage.
• Spectranext now needs cartridge firmware 1.0 or later, including for
  installed copies. Firmware 1.0 fixes the HTTPS seek that stopped 1.4.1 with
  DAT NOT FOUND!. Older firmware stops at startup with
  FIRMWARE OUTDATED: SEE README; update the cartridge firmware first.

Downloads:

• spectalk_divmmc_v1.4.2.zip: Classic ZX runtime; keep TAP, OVL and DAT
  together.
• spectalk_next_v1.4.2.zip: self-contained native Spectrum Next NEX.
• Spectranext cartridge: the URLs above. Firmware 1.0 or later is required.

Existing configuration and bookmark files need no migration. To update an
installed Spectranext copy, run the installer again.

See CHANGELOG.md
for the complete list of changes.