Add Shift Click Option in Config for Placing Vanilla Sapling

[caniplzjustlogin4godsakesthistakesforev]

In the dynamic trees common.toml file the option "#Right clicking with a vanilla sapling places a dynamic sapling instead. replaceVanillaSapling = true" is given, I'd like to propose a third state where normal right clicking with a sapling(s) will place a dynamic trees saplings, while shift clicking will place a vanilla saplings. This would allow players to grow dynamic trees and farm them, but also preserve the ability to place a vanilla sapling block, which may be needed for other mods.

[Pedrinho2015]

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