msx_io_ports: Add turbo available bit to Panasonic expanded I/O port.

Based on openMSX information and implementation;

Sanyo MSX2+ machines provide the Panasonic expanded I/O port but do not support
the turbo 5.37 MHz CPU mode. This is indicated by bit 2.
yjk: Remove incorrect and unnecessary id.
vdp_detection: Elaborate a bit more.
z80instr: Clarify that the M1 wait is not specific to the MSX-ENGINE.
z80: Update from manual revision 05 (2005-02) to revision 11 (2016-08).
z80instr: Update script to HTML5.
email: Update script to HTML5.
yjk: Add some images showing the colour bleed and screen 12 artwork.

Gulliver by Teruchan
House by windship, rearranged by FRS
おじいちゃんのほこりっぽい本が好き by 京典, rearranged by FRS
yjk: Add some additional drawing tips thanks to FRS.
yjk: New “The YJK screen modes” article
scripts: Add simple node.js dev server.
functions: Disable XHTML support.

It lacks ES modules support in Chrome.
hgignore: Ignore node_modules and .vscode.
resources: Add Microchip AY8930.
resources: Add table of contents to V9938 application manual pdf.
vdp_guide: Correct information about screen 9 and V9948.
msx_io_ports: Add warning for Franky’s SN76489 DCSG I/O port.
resources: Add SFG-01 Music BIOS reference manual.
hgignore: Ignore node_modules.
msx_io_ports: Document pause inhibit flag in turboR I/O port A7H.

Thanks to Daemos.