Changes from original pk3:
==========================
I did remove all the unused shader found in the different scripts shader files of original pk3 which are not used in the map. About 50%.
I did put all the shaders in one file.

* shaders added/repaired:
=========================
textures/base_wall/glass01 found in arena3 shader, use texture tinfx already in ut4: shader added to ut_padgarden_fix.shader
textures/liquids/calm_poollight shader refer tga texture and trigger a warning but equivalent jpeg file and shaders exists in ut4
textures/base_trim/proto_fence exist in arena3 not in UT as texture base_trim/proto_fence.tga so i added the shader to ut_padgarden_fix.shader
textures/base_trim/proto_grate  exist in UT4, use texture proto_grate.tga not found in ut4 but is inside arena3, texture added
textures/sfx/zap_scroll1000 exist in ut41 a bit different from arena3 and use tga file not found in UT. Only in arena3 as jpeg instead. 
	=> textures copied. 1 is missing but is only used for lightmap. I guess this will be ok in game.
textures/sfx/teslacoil3 exist in ut41 a bit different from arena3 and use tga file not found in UT. Only in arena3 as jpeg instead.
	=> textures copied. 1 is missing but is only used for lightmap. I guess this will be ok in game.
	
texture added/repaired:
=======================
* stone
pjrock1.jpg
pjrock6.jpg
pjrock17.jpg
rockwall.jpg

* gothic_floor
goopq1metal7_98d.jpg
blocks17floor2.jpg
blocks17floor.jpg

* base_floor
proto_grate.tga (shader use it in ut41 but texture missing)

* base_trim
proto_fence.tga needed either dirtecly as texture or by the shader of the same name base_trim/proto_fence

* base_support
vert_pipe1.jpg (found in arena3)
pipecolumn4.tga (found in arena3)

* sfx
cabletest2.tga electricslime2.jpg tesla1b.jpg needed by shader sfx/teslacoil3
zap_scroll.jpg zap_scroll2.jpg needed by shader sfx/zap_scroll1000


Models:
Missing in UT4 (found in arena3 and openarena)
models\powerups\ammo
models\powerups\armor
models\powerups\health
models\powerups\holdable
models\powerups\instant
models\weapons2\bfg
models\weapons2\grenadel
models\weapons2\lightning
models\weapons2\plasma
models\models\weapons2\railgun
models\weapons2\rocketl
models\weapons2\shotgun

sounds:
=======
sound/misc/nightmare.wav : quite sure this osund has never been heard in UT for graden but the sound exist in arena3: readded