Added PawnKindGeneExtensions; Organized JecsTools folders

[jecrell]

Using JecsTools, one can now have random chances of genes on a pawn based on its PawnKindDef.
See example below where the pawnkinddef has a 15% chance of custom genes

  <PawnKindDef Name="TownsfolkBase" Abstract="True">
    <race>Human</race>
    <defaultFactionType>ROM_Townsfolk</defaultFactionType>
    <initialWillRange>1~3</initialWillRange>
    <initialResistanceRange>15~24</initialResistanceRange>
    <chemicalAddictionChance>0.025</chemicalAddictionChance>
    <invNutrition>2.55</invNutrition>
    <itemQuality>Normal</itemQuality>
    <backstoryCryptosleepCommonality>0</backstoryCryptosleepCommonality>
    <maxGenerationAge>75</maxGenerationAge>
    <modExtensions>
      <li Class="JecsTools.PawnKindGeneExtension">
        <genes>
          <li>
            <defName>ROM_InnsmouthLook_Ears</defName>
            <chance>15</chance>
          </li>
          <li>
            <defName>ROM_InnsmouthLook_Jaw</defName>
            <chance>15</chance>
          </li>
          <li>
            <defName>ROM_InnsmouthLook_Hands</defName>
            <chance>15</chance>
          </li>
          <li>
            <defName>ROM_InnsmouthLook_Eyes</defName>
            <chance>15</chance>
          </li>
          <li>
            <defName>ROM_InnsmouthLook_Headbone_Fin</defName>
            <chance>15</chance>
          </li>
        </genes>
      </li>
    </modExtensions>
  </PawnKindDef>```