Add catfish species and update fish artwork

fish/species/catfish_flathead/catfish_flathead.tres

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+[gd_resource type="Resource" load_steps=5 format=3]
+
+[ext_resource type="Script" path="res://fish/fish_data.gd" id="1_fish_data"]
+[ext_resource type="Resource" path="res://fishing/bass_catch_profile.tres" id="2_profile"]
+[ext_resource type="Script" path="res://fish/fish_availability.gd" id="3_availability_script"]
+[ext_resource type="Texture2D" path="res://fish/species/catfish_flathead/fish_catfish_flathead.png" id="4_texture"]
+
+[sub_resource type="Resource" id="FlatheadCatfishAvailability"]
+script = ExtResource("3_availability_script")
+allowed_location_tags = Array[StringName]([&"starter_pond"])
+allow_day = true
+allow_night = true
+preferred_bait_tags = Array[StringName]([&"worm", &"minnow"])
+preferred_bait_weight_multiplier = 1.35
+
+[resource]
+script = ExtResource("1_fish_data")
+id = &"catfish_flathead"
+display_name = "flathead catfish"
+rarity = 1
+base_catch_weight = 1.0
+catch_profile = ExtResource("2_profile")
+availability = SubResource("FlatheadCatfishAvailability")
+weight_min_lb = 3.0
+weight_max_lb = 14.0
+display_scale_min = 1.0
+display_scale_max = 1.6
+display_scale_curve = 0.9
+sell_value_min = 7
+sell_value_max = 10
+sell_value_curve = 0.9
+display_texture = ExtResource("4_texture")

fish/species/catfish_flathead/fish_catfish_flathead.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bacx63lp0yh7t"
+path="res://.godot/imported/fish_catfish_flathead.png-31b800b34c27c75b84a2ee98a13ff954.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://fish/species/catfish_flathead/fish_catfish_flathead.png"
+dest_files=["res://.godot/imported/fish_catfish_flathead.png-31b800b34c27c75b84a2ee98a13ff954.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/uastc_level=0
+compress/rdo_quality_loss=0.0
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/channel_remap/red=0
+process/channel_remap/green=1
+process/channel_remap/blue=2
+process/channel_remap/alpha=3
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1