treeshaking dependency mismatches

[duncdrum]

see #91

here it goes:

package	local	upstream	Studio Extension
@theia/*	1.5.0	1.15.0	1.15.0
electron-builder	22.7.0	22.11.7	theia-apps 22.4.1
fs-extra	9.0.1	10.0.0	theia-apps 4.0.3
FSE	1.0.0	1.2.0 (npm)	1.0.3 (github)

see evolvedbinary/fusion-studio-extension#462

xterm and yargs issues have supposedly been fixed upstream so we should be good to proceed without declaring them here again.

see eclipse-theia/theia#934,
see eclipse-theia/theia#737

[duncdrum]

error find-git-exec@0.0.3: The engine "node" is incompatible with this module. Expected version ">=10.11.0 <13". Got "14.15.5"

[duncdrum]

error dugite-extra@0.1.14: The engine "node" is incompatible with this module. Expected version ">=10.11.0 <13". Got "14.15.5"