Replace PNG icon set with vector drawables, matching original colors exactly

[Copilot]

The drawable directories contained 28 icon PNGs duplicated across drawable/, drawable-xhdpi/, and drawable-xxhdpi/ (84 raster files total). These are replaced with 28 density-independent vector drawable XMLs, and the original icon colors are preserved faithfully.

Changes

PNG → Vector conversion

• Added 28 *.xml vector drawables to drawable/ using standard Material Design paths
• Deleted 84 PNG files across all three density buckets
• Kept non-icon rasters: ic_launcher.png, ic_empty_image.png, reader_bg_texture_mask.png, reader_bg_yellow_edge.png

Color corrections (matched to original PNG pixels)

The initial conversion incorrectly used #444444 for all icons. Colors extracted from the original PNGs:

Color	Icons
#F5B400 golden yellow	ic_favorate_pressed
#FFFFFF white	ic_download, ic_favorate, ic_search, ic_sign, ic_reader_daynight, ic_reader_find, ic_reader_jump, ic_reader_more
#7D7D7D medium gray	ic_about, ic_clearcache, ic_config, ic_fav, ic_latest, ic_option, ic_restore, ic_rklist, ic_update, ic_upload, ic_wallpaper
#6D6D6D medium-dark gray	ic_back, ic_find, ic_jump, ic_label, ic_viewlable, icl_config, icl_daynight
#BBBBBB light gray	ic_rightarrow

All @drawable/ic_* references in layouts, menus, and Java code are unaffected — resource names are preserved.

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[MewX]

the list of icons are good. However, the quality of the icons are really bad.

Please look up Google material icons and find similar icons and use. Lots of icon shapes are changed dramatically, and look very disruptive in the app.