Replacing existing browser tree node png icons with the svg icons. Made

it compatible with the pgAdmin 4 color combination.

TODO::
Icons for the following nodes are in PNG format.
- Domain Constraint (Only the invalid icon)
- pgAgent Job Steps
- Green Plum database server
- Server (Only server.png, which is used in the create/edit dialog)

web/pgadmin/browser/server_groups/servers/pgagent/schedules/static/img/coll-pga_schedule.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><defs><style>.cls-1,.cls-2{fill:#def4fd;stroke-miterlimit:10;stroke-width:0.75px;}.cls-1{stroke:#717f8e;}.cls-2,.cls-3{stroke:#34495e;}.cls-3{fill:none;stroke-linecap:round;stroke-linejoin:round;}</style></defs><title>coll-pga_schedule</title><circle class="cls-1" cx="5.32" cy="6.77" r="4.5"/><circle class="cls-2" cx="7.18" cy="8.45" r="4.5"/><line class="cls-3" x1="7.18" y1="5.75" x2="7.18" y2="8.45"/><line class="cls-3" x1="9.88" y1="8.45" x2="7.18" y2="8.45"/></svg>

web/pgadmin/browser/server_groups/servers/pgagent/schedules/static/img/pga_schedule.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><defs><style>.cls-1{fill:#def4fd;stroke-miterlimit:10;stroke-width:0.75px;}.cls-1,.cls-2{stroke:#34495e;}.cls-2{fill:none;stroke-linecap:round;stroke-linejoin:round;}</style></defs><title>pga_schedule</title><circle class="cls-1" cx="6.5" cy="8.5" r="5.4"/><line class="cls-2" x1="6.5" y1="4.9" x2="6.5" y2="8.5"/><line class="cls-2" x1="9.2" y1="8.5" x2="6.5" y2="8.5"/></svg>

web/pgadmin/browser/server_groups/servers/pgagent/static/img/coll-pga_job.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><defs><style>.cls-1,.cls-2{fill:#def4fd;stroke-miterlimit:10;stroke-width:0.75px;}.cls-1{stroke:#717f8e;}.cls-2{stroke:#34495e;}.cls-3{fill:#34495e;}</style></defs><title>coll-pga_job</title><rect class="cls-1" x="0.3" y="3.4" width="6.4" height="8" rx="1" ry="1"/><path class="cls-1" d="M1.9,4.2V3.4a.8.8,0,0,1,.8-.8H4.3a.8.8,0,0,1,.8.8v.8Z"/><rect class="cls-2" x="2.3" y="5.4" width="6.4" height="8" rx="1" ry="1"/><path class="cls-2" d="M3.9,6.2V5.4a.8.8,0,0,1,.8-.8H6.3a.8.8,0,0,1,.8.8v.8Z"/><path class="cls-3" d="M5,8.6V8.05H7.18V8.6Z"/><path class="cls-3" d="M5,10.2V9.65H7.18v.55Z"/><path class="cls-3" d="M5,11.8v-.55H7.18v.55Z"/><path class="cls-3" d="M3.43,8.6V8.05H4V8.6Z"/><path class="cls-3" d="M3.43,10.2V9.65H4v.55Z"/><path class="cls-3" d="M3.43,11.8v-.55H4v.55Z"/></svg>

web/pgadmin/browser/server_groups/servers/pgagent/static/img/pga_job-disabled.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><defs><style>.cls-1{fill:#f2f2f2;stroke:#717f8e;stroke-miterlimit:10;stroke-width:0.75px;}.cls-2{fill:#717f8e;}.cls-3{fill:none;stroke:#d0021b;stroke-linecap:round;stroke-linejoin:round;stroke-width:1.5px;}</style></defs><title>pga_job-disabled</title><rect class="cls-1" x="0.75" y="3.63" width="8" height="10" rx="1" ry="1"/><path class="cls-1" d="M2.75,4.63v-1a1,1,0,0,1,1-1h2a1,1,0,0,1,1,1v1Z"/><path class="cls-2" d="M4.16,7.63V6.94H6.85v.69Z"/><path class="cls-2" d="M4.16,9.63V8.94H6.85v.69Z"/><path class="cls-2" d="M4.16,11.63v-.69H6.85v.69Z"/><path class="cls-2" d="M2.16,7.63V6.94h.69v.69Z"/><path class="cls-2" d="M2.16,9.63V8.94h.69v.69Z"/><path class="cls-2" d="M2.16,11.63v-.69h.69v.69Z"/><line class="cls-3" x1="10.25" y1="3.13" x2="7.25" y2="6.13"/><line class="cls-3" x1="10.25" y1="6.13" x2="7.25" y2="3.13"/></svg>

web/pgadmin/browser/server_groups/servers/pgagent/static/img/pga_job.svg

@@ -0,0 +1 @@
+<svg id="Layer_1" data-name="Layer 1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><defs><style>.cls-1{fill:#def4fd;stroke:#34495e;stroke-miterlimit:10;stroke-width:0.75px;}.cls-2{fill:#34495e;}</style></defs><title>pga_job</title><rect class="cls-1" x="1.5" y="3.5" width="8" height="10" rx="1" ry="1"/><path class="cls-1" d="M3.5,4.5v-1a1,1,0,0,1,1-1h2a1,1,0,0,1,1,1v1Z"/><path class="cls-2" d="M4.91,7.5V6.81H7.6V7.5Z"/><path class="cls-2" d="M4.91,9.5V8.81H7.6V9.5Z"/><path class="cls-2" d="M4.91,11.5v-.69H7.6v.69Z"/><path class="cls-2" d="M2.91,7.5V6.81H3.6V7.5Z"/><path class="cls-2" d="M2.91,9.5V8.81H3.6V9.5Z"/><path class="cls-2" d="M2.91,11.5v-.69H3.6v.69Z"/></svg>